مقاله انگلیسی رایگان در مورد تاثیر خزش بتن بر استحکام پویایی ستون لوله ای فولادی – الزویر ۲۰۱۹

elsevier

 

مشخصات مقاله
ترجمه عنوان مقاله تاثیر خزش بتن بر استحکام پویایی ستون لوله ای فولادی پر شده با بتن ضعیف
عنوان انگلیسی مقاله Effect of concrete creep on dynamic stability behavior of slender concretefilled steel tubular column
انتشار مقاله سال ۲۰۱۹
تعداد صفحات مقاله انگلیسی ۹ صفحه
هزینه دانلود مقاله انگلیسی رایگان میباشد.
پایگاه داده نشریه الزویر
نوع نگارش مقاله
مقاله پژوهشی (Research article)
مقاله بیس این مقاله بیس نمیباشد
نمایه (index) scopus – master journals – JCR
نوع مقاله ISI
فرمت مقاله انگلیسی  PDF
ایمپکت فاکتور(IF)
۴٫۹۲۰ در سال ۲۰۱۷
شاخص H_index ۹۸ در سال ۲۰۱۹
شاخص SJR ۲٫۰۳۹ در سال ۲۰۱۹
رشته های مرتبط مهندسی عمران
گرایش های مرتبط سازه
نوع ارائه مقاله
ژورنال
مجله / کنفرانس کامپوزیت قسمت B: مهندسی – Composites Part B: Engineering
دانشگاه Centre for Engineering Structure Disaster Prevention and Control – Guangzhou University – China
کلمات کلیدی ستون لوله ای فولادی پر شده با بتن ضعیف، پایداری دینامیکی، تحلیل زمان، روش مدول مؤثر براساس سن، روش بولوتین
کلمات کلیدی انگلیسی Slender concrete-filled steel tube column, Dynamic stability, Time analysis, Age-adjusted effective modulus method, Bolotin’s method
شناسه دیجیتال – doi
https://doi.org/10.1016/j.compositesb.2018.08.117
کد محصول E10314
وضعیت ترجمه مقاله  ترجمه آماده این مقاله موجود نمیباشد. میتوانید از طریق دکمه پایین سفارش دهید.
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فهرست مطالب مقاله:
Abstract
Keywords
۱ Introduction
۲ Creep of concrete core under sustained static load
۳ Dynamic stability analysis accounting for creep of concrete core
۴ Numerical investigations
۵ Conclusions
Acknowledgement
References

بخشی از متن مقاله:
ABSTRACT

An analytical procedure for dynamic stability of CFST column accounting for the creep of concrete core is proposed. The long-term effect of creep of concrete core is formulated based on the creep model by the ACI 209 committee and the age-adjusted effective modulus method (AEMM). The equations of boundary frequencies accounting for the effects of concrete creep are derived by the Bolotin’s theory and solved as a quadratic eigenvalue problem. The effectiveness of the proposed method and the characteristics of time-varying distribution of instability regions are numerically surveyed. It is shown that the CFST column becomes dynamically unstable even when the sum of the sustained static load and the amplitude of the dynamic excitation is much lower than the static instability load. It is also found that due to the time effects of concrete creep under the sustained static load, the same excitation, that cannot induce dynamic instability in the early stage of sustained loading, can induce the dynamic instability in a few days later. The critical amplitude and frequency of the dynamic excitation can decrease by 6% and 3% in 5 days, and 11% and 6% in 100 days.

Introduction

Steel hollow sections are very efficient in resisting compression forces, and filling these sections with concrete greatly enhances the load-carrying capacity [1,2]. The concrete-filled steel tubular (CFST) structure possesses many mechanic benefits, such as high strength and fire resistances, favorable ductility and large energy absorption capacities, so the CFST members are widely used in modern structures [3]. Moreover, with the advancement in the strength resistance and construction techniques of CFST column, slender CFST columns are frequently adopted to support the roofs of industrial plants, the decks of railways and the floors of multistory buildings [4]. It is known when a slender column is subject to an axial compression, it could fail owing to lateral instability [5]. The instability of slender CFST columns under axial static compression has been experimentally and numerically studied by many researchers [4,6–۸]. These studies have shown that slender CFST columns are prone to global buckling under static loading. In addition to the static loading, the service loads of slender CFST members also involve the dynamic loading. For example, the slender CFST piers in modern bridges are subject to the dynamic vehicle loading, and the high CFST pillars supporting large span roofs are loaded by dynamic wind loading. The behavior of CFST columns subjected to cycles of compressive loading has also been reported by many researchers [9–۱۱]. Under a sustained centric axial static load, the concrete core of a CFST column creeps with the time and the creep of the concrete core may change the lateral stiffness and the lateral natural frequency of the CFST column significantly. If the column under the sustained load is further excited by an axial dynamic excitation at some stage, the column may suddenly lose its stability laterally due to dynamic resonance when certain relationships between the frequency of excitation and the natural frequency of the column are satisfied and the amplitudes of the excitation are sufficiently high. Because the creep of the concrete core develops with the time and changes the lateral natural frequency, the relationships between the frequency of the excitation and the natural frequency of the column and the required amplitude of the excitation inducing the dynamic instability of the CFST column may change greatly with the time. Such dynamic instability may occur even when the sum of the amplitude of the excitation and the sustained static load is much smaller than the static instability load of the column. Meanwhile, the engineering structures are commonly subject to sustained static loads and sudden dynamic excitations [12,13].

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